BAHAMA MEDUSAE. ' 23 
nematocyst-bearing ones. There are twelve otocysts, and the manubrium is 
tlask-shaped. The gonads, which begin to develop upon the radial canals at 
the four corners of the manubrium, have now migrated down the radial 
canals, although they are still small and immature. 
Cubaia geophila, of Key West, is closely allied to (\ aplirodite and iiiny be 
simply a variety of the latter. In C. geophila, however, we find none of the 
magenta-purple pigment at the bases of the tentacles. The bell is flatter, and 
the manubrium longer and more slender, and the edges of the radial canals, 
over the gonads, display dark colored, scattered pigment granules. 
In C. aphrodite the gonads are developed upon the middle portions of 
the radial canals, whik' in (J. geophila they are found upon the outer (cen- 
trifugal) halves of the canals. 
Olindias tenuis. 
Figs. 50-52, Plate V; Figs. 53-59, Plate VI. 
Mattire Medusa: Figs. 53, 54, 58, 59; Plate VI. Bell hemispherical, 
35 mm. in diameter. Gelatinous substance quite rigid. 
There are about ninety tentacles. Thirty-two of these are straight, 
about one-third as long as the bell-diameter, and arise from the sides of 
the bell in a zone at a short distance above the margin. These tentacles 
are besprinkled with wart-like clusters of nematocysts, and near their distal 
ends on the aboral side one finds an elongate, pad-like cluster of nematocyst 
cells, having a sucker-like appearance, although there is no evidence tlint it 
actually functions as an organ of adhesion. (Fig. 57, Plate VI.) 
In addition to the short, straight tentacles there are about sixty others 
which are very flexible, and are of ten seen coiled in close helices. When ex- 
tended these tentacles are about four times as long as the bell-diameter. They 
arise from the bell-margin below the zone of origin of the straight tentacles. 
A powerful strand of longitudinal muscle fibres extends throughout the en- 
tire length of the outer side of each of these velar tentach's, while half rings 
of nematocysts are found at regular intervals upon their inner side.s.* 
(See Figs. 54,58). The tentacles are thus comparable in their sti'uctnre to 
the long ones of Physalia. They terminate in a knob-like cluster of nemato- 
cysts, and upon their aboral sides near the distal end there is a flat i)a<l-like 
cluster composed of very ehmgate and thickly crowch^l ectodernuil cells. 
(Fig. 58a.) 
* According to Goto, 1903, similar rings are found on the outer sides of the velar tentacles in 
Olindioides. 
